Based on the NCEP/NCAR reanalysis data,using the methods of 31-point band-pass digital filter,linear correlation and composite analysis,this paper studies interannual variations of the western and eastern intensity index(WI and EI) of North Pacific storm track in winter from 1961/1962 to 2010/2011,defines interannual typical patterns of the storm track,and further discusses their relationships with 500 hPa geopotential height and sea level pressure(SLP) fields over Northern Hemisphere.Results show that:(1)Winter North Pacific storm track is characterized by a single maximum region in the climatological mean and two maximum regions of both mean square error distribution and climatological frequency concentration areas of maximum point at each year.(2)Interannual variations of WI and EI are partially independent,and winter North Pacific storm track can be further defined as two typical patterns(single-center pattern and double-center pattern).(3)The correlation distribution of WI(EI) with 500 hPa geopotential height field is analogous to WP(PNA) teleconnection pattern.When the single-center pattern storm track is strong,the polar vortex expands southward and the three average troughs deepen.When the double-center pattern storm track exists,the polar vortex is significantly westward.(4)The correlation distribution of WI(EI) with SLP field is analogous to NPO(NAO) teleconnection pattern.When the single-center pattern storm track is strong(week),SLP anomaly field presents a positive (negative) phase of AO teleconnection pattern.